Electric controller



, Dec. 13, 1927. 1,652,391

H. E.'CAMPBELL ELECTRIC CONTROLLER Filed Nov 27, 1922 s Sh e et s-Sheet 1' IN VEN TOR.

MM 5 W 777M 50W? A TTORNEYS.

Dec. 13, 1927. H. E.- CAMPBELL ELECTRIC CONTROLLER 5 Shgets-Sheet 2 Filed Nov. 27, 1922 v/ INVENTOR. By 6 5% ?77 J(+ I ATTORNEYS.

Dec. 13, 1927.

H. E. CAMPBELL ELBCTRI C CONTROLLER 5 Shgets-Sheet 5 Filed Nov 27, 1922 I INVENTOR.

Dec. 13, 1927. 1,652,391

H. E. CAMPBELL ELECTRIC CONTROLLER Filed Nov. 27, 1922 s She ets-Sheet 5 llig v 7 v QAIZVQENTOR.

ATTORNEYS.

Patented Dec. 13, 1927.

1mm stares:

HARRY E. CAMPBELL, OF MILYVAll-KEE, WISCOESIN; ASSIGNOR TO UNION"ELECTRIC MANUFACTURINGCOMPANY, OF MILWAUKEE,

WISCONSIN;

PAfITE-NT cart-cs.

ELECTRIC CONTROLLER.

Application filed November 27,1922. Serial No. 603;613. i

the particular constructionand arrangement of the ,casingwherein a gas-tightchamber is provided so that 111 the event an arcing of thecontacts ocourno flame or burning material canescape from the, interior of the casing;thuseliminating the possibility of e2;v plosionss.

'Another. feature of the inventionresides in the constructionof the door for closing the casing whereby agas-tight joint between the door and: casingis established and the door secured or released with facility.

Anotherimportant feature ofthis inventioniresides inthe constructionwhereby electrical connection may bemadewith the con-,

tacts at the exterior of the casing-v Another important feature of construction resides in the provision of grooves on the controllingshafts and on the portionof the doorzwhich engages the casing thereby providing expansion and COOlll'lgCljlHIllbBl'S for any flaming gas whichmay escape through these points.

The novel combination, construction and arrangement of parts, wherein the features of thisinvcntion are efficiently accomplished will beumade more apparent as, the 1 descriptron proceeds, especially whencouside'rcd 111 connection with the accompanying drawings wherein:

Fig.1 1 :is an elevationof a controller con structed in accordance with this invention certain parts being broken away,

Fig. 2 is a side elevation of the controllen Fig. 3 is a fragmentary elevational view showing a detail of construction,

Fig. 4 is a top plan View,

Fig. 5 is a fragmentary sectional view,

Fig. 6 is a horizontal section taken on the plane indicated by line 6-6 in Fig. 1, and

Fig. 7 is a similar view taken on the plane indicated by line 7-7 in Fig. 1.

Referring now to the drawings wherein like reference characters indicate like parts the novel combination and construction will be described, a detailed description of the 'lhe'controllerconsists mainly of a casing 10 within which are housed ,therontrollern parts and through, which passes the control,- ler shafts'll and 12. A,controller handle 13 is secured to the main controller shaft and, an 1 operating handle 14 tovthe other controlling or reversing shaft.

Thema-in casing 10 is-open at one side or door 15 formedpreferably with a flanged,-

portion16 which engages a flange 17 formedon the caslng.

thereof whichopen sideis closed by a cover The door and easing are formed with cooperating lugsso that'the doormay be hinged tothe casing 'as indicated at 18.

For locking the door in place there is provlded a plurality of locking clips 19 which are hook shaped andvare eachiprovided adjacent oneof their endswith a beveled. or in-:

clined surface 20 adapted to engage aledge or rib 21 formed on the casing 10. The other end of each lockingv clip .19 :lies substantially WISCONSIN, A- CORPORATION OF ina parallel plane with the door or cover15,,

and is slotted asindicated at 22. A bolt 23.

passes through-the slot of eachiclip 19 and into the cover 15 so. that the clips 19.are.dis-.-

placeably and slid ably mounted; on the cover 15, these locking clips being movable a dis- I tance corresponding to the length ofthe slots 22.

Horizontal members 24: arranged onboth sides of the door engage the clips 19 for horizontally displacing the same, this displacement taking place by reason of an actuating or 1 locking bolt engages nuts 26, which engage recesses 27 formed in enlr 'gements 28 on the members 24. An operating handle 29 is keyed to the locking shaft 25 so that this shaft may be rotated and the pitch of the screw-threads is such that the shaft is rotated the memhere 24 will either be moved toward or from one another and will consequently cause an engagement or disengagement of the locking clips 19 with the ledge 21 of the casing 10. In this manner all four locking clips 19 are caused to simultaneously engage the casing and with a uniform pressure so that the cover 15 may be firmly clamped in place.

The electrical circuit of the controller in- 25 wvhich screw-threadedly eludes a blow-out coil 30 and contact switches 31 which are mounted on the cover 15 in such a position that when the cover 15 is closed the circuit will be completed. However, when the cover 15 is removed the electrical circuit of the controller is opened and hence no are or short circuit may occur which might ignite combustible gas in proximity to the controller.

The circuits of the controller includes a plurality of contacts 32 which extend through the casing and have terminals 33 arranged on. the exterior of the casing 10 so that electrical connection therewith may be facilitated. For enclosing the electrical connection with these contacts there is provided supplemental casings or housings 34.- which are secured to the main housing by bolts 35. By this arrangement electrical connections may be made or altered without opening the main casing.

The controller shafts 11 and 12 are each provided with a'plurality of small grooves 36 which act as expansion and cooling chambers for any flaming gas which might tend to seep through and escape from the casing 10 at this point. Any flaming gases at this point are effectually cooled below the ignition point before emerging so that possibility of the same igniting any combustible gases in proximity of the controller is eliminated.

Furthermore the flange 16 of the cover 15 is provided with a plurality of grooves 37 which act similarly to the grooves 36.

From the foregoing itwill be apparent that there is provided a controller having a casing which is gas-tight to the extent that flaming gases cannot effectually escape. Furthermore, means'are provided whereby the controller circuit is open when the casing is opened for the purpose of examining the interior thereof or replacing worn or broken parts. Means are furthermore provided whereby electrical connection with the controller contacts may be made at the exterior of the main casing without necessitating the opening of the same.

Consistent with the desire for a gas-tight container, means are provided whereby the cover or door of the container may be securely clamped in its closed position, the door being clamped at spaced intervals sin'iultaneously with an equalizing clamping pressure by the actuation of a single clamping bolt.

Various modifications may suggest themselves and to this end reservation is made to make such changes in the specific construction illustrated. as may come within the purview of the accompanying claims.

Having thus described the invention, what I claim is:

1. In an electric controller, a casing for the controller shaft and contacts, a door for said casing, locking clips having inclined faces carried by said door and ngaging said casing at spaced points and a locking bolt operable to capse the inclined faces of said clips to simultaneously ei'igagc said casing to clampingly secure said door in closed position.

2. In an electric controller, a casing, a door having a gas-tight connection with said casing, locking clips having inclined faces slidably mounted on said door at spaced points about its edge and adapted to engage said casing for locking said door in closed position and a. locking boltconnected to said clips whereby upon operation of said bolt the inclined faces of said clips will be caused to simultaneously engage said casing, and clampingly draw said door to said casing in a plane at right angles to the movement of said clips.

3. In an electric controller, a casing, a door for said casing, said door being formed with a peripheral flange which engages said casing in the closed position of said door, said flange being provided with a plurality of spaced gas cooling grooves, as and for the purpose set forth.

4. In an electric controller, a casing, controller shafts extending through said cas-' ing, said shafts being provided with grooves whereby flaming gas escaping from the casing at this point is cooled below the ignition point.

In testimony whereof, I atlix my signature HARRY E. CAMPBELL. 

